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                    2-7 其它配置项
            
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                    4-8 压缩代码
            
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                    4-10 使用 Tree Shaking
            
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                    4-11 提取公共代码
            
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                    4-15 输出分析
            
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                    4-16 优化总结
            
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                    5-1 工作原理概括
            
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                    5-2 输出文件分析
            
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                    5-4 编写 Plugin
            
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                    5-5 调试 Webpack
            
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                    5-6 原理总结
            
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<p>ECMAScript 6.0 &#x662F;2015&#x5E74;&#x53D1;&#x5E03;&#x7684;&#x4E0B;&#x4E00;&#x4EE3; JavaScript &#x8BED;&#x8A00;&#x6807;&#x51C6;&#xFF0C;&#x5B83;&#x5F15;&#x5165;&#x4E86;&#x65B0;&#x7684;&#x8BED;&#x6CD5;&#x548C; API &#x6765;&#x63D0;&#x5347;&#x5F00;&#x53D1;&#x6548;&#x7387;&#x3002;</p>
<p></p><p>&#x60F3;&#x5B66;&#x4E60;&#x66F4;&#x591A; ES6 &#x7684;&#x65B0;&#x7279;&#x6027;&#xFF0C;&#x63A8;&#x8350;&#x9605;&#x8BFB;&#x962E;&#x4E00;&#x5CF0;&#x7684;&#x300A;ECMAScript 6 &#x5165;&#x95E8;&#x300B;&#xFF1A;</p>
<a rel="noreferrer" href="https://union-click.jd.com/jdc?e=&amp;p=AyIGZRhZFwsQAlIfWxwyEgdRGFwWBBE3EUQDS10iXhBeGlcJDBkNXg9JHU4YDk5ER1xOGRNLGEEcVV8BXURFUFdfC0RVU1JRUy1OVxUCFgRSGF0WMhR%2FIx5SUF5wYgIcL21GUHAzbQdrfkQLWStaJQITBlQZXxMCFAVlK1sSMkBpja3tzaejG4Gx1MCKhTdUK1sRChUDVB1ZFgMUBF0rXBULIl4FRh1RMiI3VitrJQIiBGVZNRcBE1cBH18TBBIPAR5dRlJCBlwZUxMFGwMBTFkcAEICZRlaFAYb" target="_blank">
<img src="http://es6.ruanyifeng.com/images/cover_thumbnail_3rd.jpg">
</a><p></p>
<p>&#x867D;&#x7136;&#x76EE;&#x524D;&#x90E8;&#x5206;&#x6D4F;&#x89C8;&#x5668;&#x548C; Node.js &#x5DF2;&#x7ECF;&#x652F;&#x6301; ES6&#xFF0C;&#x4F46;&#x7531;&#x4E8E;&#x5B83;&#x4EEC;&#x5BF9; ES6 &#x6240;&#x6709;&#x7684;&#x6807;&#x51C6;&#x652F;&#x6301;&#x4E0D;&#x5168;&#xFF0C;&#x8FD9;&#x5BFC;&#x81F4;&#x5728;&#x5F00;&#x53D1;&#x4E2D;&#x4E0D;&#x6562;&#x5168;&#x9762;&#x5730;&#x4F7F;&#x7528; ES6&#x3002;</p>
<p>&#x901A;&#x5E38;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x628A;&#x91C7;&#x7528; ES6 &#x7F16;&#x5199;&#x7684;&#x4EE3;&#x7801;&#x8F6C;&#x6362;&#x6210;&#x76EE;&#x524D;&#x5DF2;&#x7ECF;&#x652F;&#x6301;&#x826F;&#x597D;&#x7684; ES5 &#x4EE3;&#x7801;&#xFF0C;&#x8FD9;&#x5305;&#x542B;2&#x4EF6;&#x4E8B;&#xFF1A;</p>
<ol>
<li>&#x628A;&#x65B0;&#x7684; ES6 &#x8BED;&#x6CD5;&#x7528; ES5 &#x5B9E;&#x73B0;&#xFF0C;&#x4F8B;&#x5982; ES6 &#x7684; <code>class</code> &#x8BED;&#x6CD5;&#x7528; ES5 &#x7684; <code>prototype</code> &#x5B9E;&#x73B0;&#x3002;</li>
<li>&#x7ED9;&#x65B0;&#x7684; API &#x6CE8;&#x5165; polyfill &#xFF0C;&#x4F8B;&#x5982;&#x9879;&#x76EE;&#x4F7F;&#x7528; <code>fetch</code> API &#x65F6;&#xFF0C;&#x53EA;&#x6709;&#x6CE8;&#x5165;&#x5BF9;&#x5E94;&#x7684; polyfill &#x540E;&#xFF0C;&#x624D;&#x80FD;&#x5728;&#x4F4E;&#x7248;&#x672C;&#x6D4F;&#x89C8;&#x5668;&#x4E2D;&#x6B63;&#x5E38;&#x8FD0;&#x884C;&#x3002;</li>
</ol>
<h2 id="babel">Babel</h2>
<p><a href="https://babeljs.io" target="_blank">Babel</a> &#x53EF;&#x4EE5;&#x65B9;&#x4FBF;&#x7684;&#x5B8C;&#x6210;&#x4EE5;&#x4E0A;2&#x4EF6;&#x4E8B;&#x3002;
Babel &#x662F;&#x4E00;&#x4E2A; JavaScript &#x7F16;&#x8BD1;&#x5668;&#xFF0C;&#x80FD;&#x5C06; ES6 &#x4EE3;&#x7801;&#x8F6C;&#x4E3A; ES5 &#x4EE3;&#x7801;&#xFF0C;&#x8BA9;&#x4F60;&#x4F7F;&#x7528;&#x6700;&#x65B0;&#x7684;&#x8BED;&#x8A00;&#x7279;&#x6027;&#x800C;&#x4E0D;&#x7528;&#x62C5;&#x5FC3;&#x517C;&#x5BB9;&#x6027;&#x95EE;&#x9898;&#xFF0C;&#x5E76;&#x4E14;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x63D2;&#x4EF6;&#x673A;&#x5236;&#x6839;&#x636E;&#x9700;&#x6C42;&#x7075;&#x6D3B;&#x7684;&#x6269;&#x5C55;&#x3002;
&#x5728; Babel &#x6267;&#x884C;&#x7F16;&#x8BD1;&#x7684;&#x8FC7;&#x7A0B;&#x4E2D;&#xFF0C;&#x4F1A;&#x4ECE;&#x9879;&#x76EE;&#x6839;&#x76EE;&#x5F55;&#x4E0B;&#x7684; <code>.babelrc</code> &#x6587;&#x4EF6;&#x8BFB;&#x53D6;&#x914D;&#x7F6E;&#x3002;<code>.babelrc</code> &#x662F;&#x4E00;&#x4E2A; JSON &#x683C;&#x5F0F;&#x7684;&#x6587;&#x4EF6;&#xFF0C;&#x5185;&#x5BB9;&#x5927;&#x81F4;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-json">{
  <span class="hljs-string">&quot;plugins&quot;</span>: [
    [
      <span class="hljs-string">&quot;transform-runtime&quot;</span>,
      {
        <span class="hljs-string">&quot;polyfill&quot;</span>: <span class="hljs-literal">false</span>
      }
    ]
   ],
  <span class="hljs-string">&quot;presets&quot;</span>: [
    [
      <span class="hljs-string">&quot;es2015&quot;</span>,
      {
        <span class="hljs-string">&quot;modules&quot;</span>: <span class="hljs-literal">false</span>
      }
    ],
    <span class="hljs-string">&quot;stage-2&quot;</span>,
    <span class="hljs-string">&quot;react&quot;</span>
  ]
}
</code></pre>
<h3 id="plugins">Plugins</h3>
<p><code>plugins</code> &#x5C5E;&#x6027;&#x544A;&#x8BC9; Babel &#x8981;&#x4F7F;&#x7528;&#x54EA;&#x4E9B;&#x63D2;&#x4EF6;&#xFF0C;&#x63D2;&#x4EF6;&#x53EF;&#x4EE5;&#x63A7;&#x5236;&#x5982;&#x4F55;&#x8F6C;&#x6362;&#x4EE3;&#x7801;&#x3002;</p>
<p>&#x4EE5;&#x4E0A;&#x914D;&#x7F6E;&#x6587;&#x4EF6;&#x91CC;&#x7684; <code>transform-runtime</code> &#x5BF9;&#x5E94;&#x7684;&#x63D2;&#x4EF6;&#x5168;&#x540D;&#x53EB;&#x505A; <code>babel-plugin-transform-runtime</code>&#xFF0C;&#x5373;&#x5728;&#x524D;&#x9762;&#x52A0;&#x4E0A;&#x4E86; <code>babel-plugin-</code>&#xFF0C;&#x8981;&#x8BA9; Babel &#x6B63;&#x5E38;&#x8FD0;&#x884C;&#x6211;&#x4EEC;&#x5FC5;&#x987B;&#x5148;&#x5B89;&#x88C5;&#x5B83;&#xFF1A;</p>
<pre><code class="lang-bash">npm i -D babel-plugin-transform-runtime
</code></pre>
<p><code>babel-plugin-transform-runtime</code> &#x662F; Babel &#x5B98;&#x65B9;&#x63D0;&#x4F9B;&#x7684;&#x4E00;&#x4E2A;&#x63D2;&#x4EF6;&#xFF0C;&#x4F5C;&#x7528;&#x662F;&#x51CF;&#x5C11;&#x5197;&#x4F59;&#x4EE3;&#x7801;&#x3002;
Babel &#x5728;&#x628A; ES6 &#x4EE3;&#x7801;&#x8F6C;&#x6362;&#x6210; ES5 &#x4EE3;&#x7801;&#x65F6;&#x901A;&#x5E38;&#x9700;&#x8981;&#x4E00;&#x4E9B; ES5 &#x5199;&#x7684;&#x8F85;&#x52A9;&#x51FD;&#x6570;&#x6765;&#x5B8C;&#x6210;&#x65B0;&#x8BED;&#x6CD5;&#x7684;&#x5B9E;&#x73B0;&#xFF0C;&#x4F8B;&#x5982;&#x5728;&#x8F6C;&#x6362; <code>class extent</code> &#x8BED;&#x6CD5;&#x65F6;&#x4F1A;&#x5728;&#x8F6C;&#x6362;&#x540E;&#x7684; ES5 &#x4EE3;&#x7801;&#x91CC;&#x6CE8;&#x5165; <code>_extent</code> &#x8F85;&#x52A9;&#x51FD;&#x6570;&#x7528;&#x4E8E;&#x5B9E;&#x73B0;&#x7EE7;&#x627F;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">_extent</span>(<span class="hljs-params">target</span>) </span>{
  <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">1</span>; i &lt; <span class="hljs-built_in">arguments</span>.length; i++) {
    <span class="hljs-keyword">var</span> source = <span class="hljs-built_in">arguments</span>[i];
    <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> key <span class="hljs-keyword">in</span> source) {
      <span class="hljs-keyword">if</span> (<span class="hljs-built_in">Object</span>.prototype.hasOwnProperty.call(source, key)) {
        target[key] = source[key];
      }
    }
  }
  <span class="hljs-keyword">return</span> target;
}
</code></pre>
<p>&#x8FD9;&#x4F1A;&#x5BFC;&#x81F4;&#x6BCF;&#x4E2A;&#x4F7F;&#x7528;&#x4E86; <code>class extent</code> &#x8BED;&#x6CD5;&#x7684;&#x6587;&#x4EF6;&#x90FD;&#x88AB;&#x6CE8;&#x5165;&#x91CD;&#x590D;&#x7684;<code>_extent</code> &#x8F85;&#x52A9;&#x51FD;&#x6570;&#x4EE3;&#x7801;&#xFF0C;<code>babel-plugin-transform-runtime</code> &#x7684;&#x4F5C;&#x7528;&#x5728;&#x4E8E;&#x4E0D;&#x628A;&#x8F85;&#x52A9;&#x51FD;&#x6570;&#x5185;&#x5BB9;&#x6CE8;&#x5165;&#x5230;&#x6587;&#x4EF6;&#x91CC;&#xFF0C;&#x800C;&#x662F;&#x6CE8;&#x5165;&#x4E00;&#x6761;&#x5BFC;&#x5165;&#x8BED;&#x53E5;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">var</span> _extent = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;babel-runtime/helpers/_extent&apos;</span>);
</code></pre>
<p>&#x8FD9;&#x6837;&#x80FD;&#x51CF;&#x5C0F; Babel &#x7F16;&#x8BD1;&#x51FA;&#x6765;&#x7684;&#x4EE3;&#x7801;&#x7684;&#x6587;&#x4EF6;&#x5927;&#x5C0F;&#x3002;</p>
<p>&#x540C;&#x65F6;&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#x7531;&#x4E8E; <code>babel-plugin-transform-runtime</code> &#x6CE8;&#x5165;&#x4E86; <code>require(&apos;babel-runtime/helpers/_extent&apos;)</code> &#x8BED;&#x53E5;&#x5230;&#x7F16;&#x8BD1;&#x540E;&#x7684;&#x4EE3;&#x7801;&#x91CC;&#xFF0C;&#x9700;&#x8981;&#x5B89;&#x88C5; <code>babel-runtime</code> &#x4F9D;&#x8D56;&#x5230;&#x4F60;&#x7684;&#x9879;&#x76EE;&#x540E;&#xFF0C;&#x4EE3;&#x7801;&#x624D;&#x80FD;&#x6B63;&#x5E38;&#x8FD0;&#x884C;&#x3002;
&#x4E5F;&#x5C31;&#x662F;&#x8BF4; <code>babel-plugin-transform-runtime</code> &#x548C; <code>babel-runtime</code> &#x9700;&#x8981;&#x914D;&#x5957;&#x4F7F;&#x7528;&#xFF0C;&#x4F7F;&#x7528;&#x4E86; <code>babel-plugin-transform-runtime</code> &#x540E;&#x4E00;&#x5B9A;&#x9700;&#x8981; <code>babel-runtime</code>&#x3002;</p>
<h3 id="presets">Presets</h3>
<p><code>presets</code> &#x5C5E;&#x6027;&#x544A;&#x8BC9; Babel &#x8981;&#x8F6C;&#x6362;&#x7684;&#x6E90;&#x7801;&#x4F7F;&#x7528;&#x4E86;&#x54EA;&#x4E9B;&#x65B0;&#x7684;&#x8BED;&#x6CD5;&#x7279;&#x6027;&#xFF0C;&#x4E00;&#x4E2A; Presets &#x5BF9;&#x4E00;&#x7EC4;&#x65B0;&#x8BED;&#x6CD5;&#x7279;&#x6027;&#x63D0;&#x4F9B;&#x652F;&#x6301;&#xFF0C;&#x591A;&#x4E2A; Presets &#x53EF;&#x4EE5;&#x53E0;&#x52A0;&#x3002;
Presets &#x5176;&#x5B9E;&#x662F;&#x4E00;&#x7EC4; Plugins &#x7684;&#x96C6;&#x5408;&#xFF0C;&#x6BCF;&#x4E00;&#x4E2A; Plugin &#x5B8C;&#x6210;&#x4E00;&#x4E2A;&#x65B0;&#x8BED;&#x6CD5;&#x7684;&#x8F6C;&#x6362;&#x5DE5;&#x4F5C;&#x3002;Presets &#x662F;&#x6309;&#x7167; ECMAScript &#x8349;&#x6848;&#x6765;&#x7EC4;&#x7EC7;&#x7684;&#xFF0C;&#x901A;&#x5E38;&#x53EF;&#x4EE5;&#x5206;&#x4E3A;&#x4EE5;&#x4E0B;&#x4E09;&#x5927;&#x7C7B;&#xFF1A;</p>
<ol>
<li><p>&#x5DF2;&#x7ECF;&#x88AB;&#x5199;&#x5165; ECMAScript &#x6807;&#x51C6;&#x91CC;&#x7684;&#x7279;&#x6027;&#xFF0C;&#x7531;&#x4E8E;&#x4E4B;&#x524D;&#x6BCF;&#x5E74;&#x90FD;&#x6709;&#x65B0;&#x7279;&#x6027;&#x88AB;&#x52A0;&#x5165;&#x5230;&#x6807;&#x51C6;&#x91CC;&#xFF0C;&#x6240;&#x4EE5;&#x53C8;&#x53EF;&#x7EC6;&#x5206;&#x4E3A;&#xFF1A;</p>
<ul>
<li><a href="https://babeljs.io/docs/plugins/preset-es2015/" target="_blank">es2015</a> &#x5305;&#x542B;&#x5728;2015&#x91CC;&#x52A0;&#x5165;&#x7684;&#x65B0;&#x7279;&#x6027;&#xFF1B;</li>
<li><a href="https://babeljs.io/docs/plugins/preset-es2016/" target="_blank">es2016</a> &#x5305;&#x542B;&#x5728;2016&#x91CC;&#x52A0;&#x5165;&#x7684;&#x65B0;&#x7279;&#x6027;&#xFF1B;</li>
<li><a href="https://babeljs.io/docs/plugins/preset-es2017/" target="_blank">es2017</a> &#x5305;&#x542B;&#x5728;2017&#x91CC;&#x52A0;&#x5165;&#x7684;&#x65B0;&#x7279;&#x6027;&#xFF1B;</li>
<li><a href="https://babeljs.io/docs/plugins/preset-env/" target="_blank">env</a> &#x5305;&#x542B;&#x5F53;&#x524D;&#x6240;&#x6709; ECMAScript &#x6807;&#x51C6;&#x91CC;&#x7684;&#x6700;&#x65B0;&#x7279;&#x6027;&#x3002;</li>
</ul>
<p>&#x5B83;&#x4EEC;&#x4E4B;&#x95F4;&#x7684;&#x5173;&#x7CFB;&#x5982;&#x56FE;&#xFF1A;</p>
<p><img src="img/3-1presets-es.png" alt="&#x56FE;3.1.1 ECMAScript &#x6807;&#x51C6;&#x91CC;&#x7684;&#x7279;&#x6027;&#x5173;&#x7CFB;&#x56FE;"></p>
</li>
<li><p>&#x88AB;&#x793E;&#x533A;&#x63D0;&#x51FA;&#x6765;&#x7684;&#x4F46;&#x8FD8;&#x672A;&#x88AB;&#x5199;&#x5165; ECMAScript &#x6807;&#x51C6;&#x91CC;&#x7279;&#x6027;&#xFF0C;&#x8FD9;&#x5176;&#x4E2D;&#x53C8;&#x5206;&#x4E3A;&#x4EE5;&#x4E0B;&#x56DB;&#x79CD;&#xFF1A;</p>
<ul>
<li><a href="https://babeljs.io/docs/plugins/preset-stage-0/" target="_blank">stage0</a> &#x53EA;&#x662F;&#x4E00;&#x4E2A;&#x7F8E;&#x597D;&#x6FC0;&#x8FDB;&#x7684;&#x60F3;&#x6CD5;&#xFF0C;&#x6709; Babel &#x63D2;&#x4EF6;&#x5B9E;&#x73B0;&#x4E86;&#x5BF9;&#x8FD9;&#x4E9B;&#x7279;&#x6027;&#x7684;&#x652F;&#x6301;&#xFF0C;&#x4F46;&#x662F;&#x4E0D;&#x786E;&#x5B9A;&#x662F;&#x5426;&#x4F1A;&#x88AB;&#x5B9A;&#x4E3A;&#x6807;&#x51C6;&#xFF1B;</li>
<li><a href="https://babeljs.io/docs/plugins/preset-stage-1/" target="_blank">stage1</a> &#x503C;&#x5F97;&#x88AB;&#x7EB3;&#x5165;&#x6807;&#x51C6;&#x7684;&#x7279;&#x6027;&#xFF1B;</li>
<li><a href="https://babeljs.io/docs/plugins/preset-stage-2/" target="_blank">stage2</a> &#x8BE5;&#x7279;&#x6027;&#x89C4;&#x8303;&#x5DF2;&#x7ECF;&#x88AB;&#x8D77;&#x8349;&#xFF0C;&#x5C06;&#x4F1A;&#x88AB;&#x7EB3;&#x5165;&#x6807;&#x51C6;&#x91CC;&#xFF1B;</li>
<li><a href="https://babeljs.io/docs/plugins/preset-stage-3/" target="_blank">stage3</a> &#x8BE5;&#x7279;&#x6027;&#x89C4;&#x8303;&#x5DF2;&#x7ECF;&#x5B9A;&#x7A3F;&#xFF0C;&#x5404;&#x5927;&#x6D4F;&#x89C8;&#x5668;&#x5382;&#x5546;&#x548C; Node.js &#x793E;&#x533A;&#x5F00;&#x59CB;&#x7740;&#x624B;&#x5B9E;&#x73B0;&#xFF1B;</li>
<li>stage4 &#x5728;&#x63A5;&#x4E0B;&#x6765;&#x7684;&#x4E00;&#x5E74;&#x5C06;&#x4F1A;&#x52A0;&#x5165;&#x5230;&#x6807;&#x51C6;&#x91CC;&#x53BB;&#x3002;</li>
</ul>
<p>&#x5B83;&#x4EEC;&#x4E4B;&#x95F4;&#x7684;&#x5173;&#x7CFB;&#x5982;&#x56FE;&#xFF1A;</p>
<p><img src="img/3-1presets-stage.png" alt="&#x56FE;3.1.2 stage &#x5173;&#x7CFB;&#x56FE;"></p>
</li>
</ol>
<ol>
<li>&#x4E3A;&#x4E86;&#x652F;&#x6301;&#x4E00;&#x4E9B;&#x7279;&#x5B9A;&#x5E94;&#x7528;&#x573A;&#x666F;&#x4E0B;&#x7684;&#x8BED;&#x6CD5;&#xFF0C;&#x548C; ECMAScript &#x6807;&#x51C6;&#x6CA1;&#x6709;&#x5173;&#x7CFB;&#xFF0C;&#x4F8B;&#x5982; <code>babel-preset-react</code> &#x662F;&#x4E3A;&#x4E86;&#x652F;&#x6301; React &#x5F00;&#x53D1;&#x4E2D;&#x7684; JSX &#x8BED;&#x6CD5;&#x3002;</li>
</ol>
<p>&#x5728;&#x5B9E;&#x9645;&#x5E94;&#x7528;&#x4E2D;&#xFF0C;&#x4F60;&#x9700;&#x8981;&#x6839;&#x636E;&#x9879;&#x76EE;&#x6E90;&#x7801;&#x6240;&#x4F7F;&#x7528;&#x7684;&#x8BED;&#x6CD5;&#x53BB;&#x5B89;&#x88C5;&#x5BF9;&#x5E94;&#x7684; Plugins &#x6216; Presets&#x3002;</p>
<h2 id="&#x63A5;&#x5165;-babel">&#x63A5;&#x5165; Babel</h2>
<p>&#x5728;&#x4E86;&#x89E3; Babel &#x540E;&#xFF0C;&#x4E0B;&#x4E00;&#x6B65;&#x8981;&#x77E5;&#x9053;&#x5982;&#x4F55;&#x5728; Webpack &#x4E2D;&#x4F7F;&#x7528;&#x5B83;&#x3002;
&#x7531;&#x4E8E; Babel &#x6240;&#x505A;&#x7684;&#x4E8B;&#x60C5;&#x662F;&#x8F6C;&#x6362;&#x4EE3;&#x7801;&#xFF0C;&#x6240;&#x4EE5;&#x5E94;&#x8BE5;&#x901A;&#x8FC7; Loader &#x53BB;&#x63A5;&#x5165; Babel&#xFF0C;Webpack &#x914D;&#x7F6E;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-built_in">module</span>.exports = {
  <span class="hljs-built_in">module</span>: {
    rules: [
      {
        test: <span class="hljs-regexp">/\.js$/</span>,
        use: [<span class="hljs-string">&apos;babel-loader&apos;</span>],
      },
    ]
  },
  <span class="hljs-comment">// &#x8F93;&#x51FA; source-map &#x65B9;&#x4FBF;&#x76F4;&#x63A5;&#x8C03;&#x8BD5; ES6 &#x6E90;&#x7801;</span>
  devtool: <span class="hljs-string">&apos;source-map&apos;</span>
};
</code></pre>
<p>&#x914D;&#x7F6E;&#x547D;&#x4E2D;&#x4E86;&#x9879;&#x76EE;&#x76EE;&#x5F55;&#x4E0B;&#x6240;&#x6709;&#x7684; JavaScript &#x6587;&#x4EF6;&#xFF0C;&#x901A;&#x8FC7; <code>babel-loader</code> &#x53BB;&#x8C03;&#x7528; Babel &#x5B8C;&#x6210;&#x8F6C;&#x6362;&#x5DE5;&#x4F5C;&#x3002;
&#x5728;&#x91CD;&#x65B0;&#x6267;&#x884C;&#x6784;&#x5EFA;&#x524D;&#xFF0C;&#x9700;&#x8981;&#x5148;&#x5B89;&#x88C5;&#x65B0;&#x5F15;&#x5165;&#x7684;&#x4F9D;&#x8D56;&#xFF1A;</p>
<pre><code class="lang-bash"><span class="hljs-comment"># Webpack &#x63A5;&#x5165; Babel &#x5FC5;&#x987B;&#x4F9D;&#x8D56;&#x7684;&#x6A21;&#x5757;</span>
npm i -D babel-core babel-loader
<span class="hljs-comment"># &#x6839;&#x636E;&#x4F60;&#x7684;&#x9700;&#x6C42;&#x9009;&#x62E9;&#x4E0D;&#x540C;&#x7684; Plugins &#x6216; Presets</span>
npm i -D babel-preset-env
</code></pre>
<blockquote>
<p>&#x672C;&#x5B9E;&#x4F8B;<a href="http://webpack.wuhaolin.cn/3-1&#x4F7F;&#x7528;ES6&#x8BED;&#x8A00;.zip" target="_blank">&#x63D0;&#x4F9B;&#x9879;&#x76EE;&#x5B8C;&#x6574;&#x4EE3;&#x7801;</a></p>
</blockquote>

                                
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